Multifunction knife sharpener



FIG. 1 is a top, rear, left side perspective view of a multifunction knife sharpener showing my new design;

FIG. 2 is a bottom, front, right side perspective view thereof;

FIG. 3 is an enlarged front elevation view thereof;

FIG. 4 is an enlarged rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the multifunction knife sharpener that form no part of the claimed design. 

CLAIM The ornamental design for a multifunction knife sharpener, as shown and described. 